<template>
  <view>
    <!-- 搜索栏 -->
    <view class="search-box">
      <uni-search-bar @input="input" :radius="100" cancelButton='none'></uni-search-bar>
    </view>

    <!-- 搜索建议 -->
    <view class="sugg-list" v-if="searchResults.length !== 0">
      <view class="sugg-item" v-for="(item,index) in searchResults" :key='index' @click="gotoDetatil(item)">
        <view class="goods-name">{{item.goods_name}}</view>
        <uni-icons type='arrowright' size='16'></uni-icons>
      </view>
    </view>
    
    <!-- 搜索历史 -->
    <view class="history-box" v-else>
      <!-- 标题 -->
      <view class="history-title">
        <text>搜索历史</text>
        <uni-icons type='trash' size='17' @click='clean'></uni-icons>
      </view>
      <!-- 列表 -->
      <view class="history-list">
        <uni-tag :text="item" v-for="(item,index) in histories" :key='index' @click="gotoGoodsList(item)"></uni-tag>
      </view>
    </view>
    
  </view>
</template>

<script>
  export default {
    data() {
      return {
        timer: null, //延时器状态
        kw: '', //搜索文本内容
        searchResults: [] ,//搜索结果的列表
        historyList:[]  //搜索历史
      };
    },
    
    onLoad() {
    this.historyList=JSON.parse(uni.getStorageSync('kw') || '[]')  
    },
    
    methods: {
      // inout输入事件(防抖处理)
      input(e) {
        clearTimeout(this.timer)
        this.timer = setTimeout(() => {
          this.kw = e.value
          this.getSearchList()
        }, 500)
      },

      // 搜索列表的请求
      async getSearchList() {
        // 判断是否有搜索内容
        if (this.kw.length === 0) {
          this.searchResults = []
          return
        }
        // 发请求
        const {
          data: res
        } = await uni.$http.get('/api/public/v1/goods/qsearch', {
          query: this.kw
        })
        // 判断请求状态
        if (res.meta.status !== 200) return uni.$showMsg()
        // 赋值搜索结果
        this.searchResults = res.message
        // 
        this.saveSearchHistory()
      },
      
      // 搜索建议项跳转详情
      gotoDetatil(item) {
        uni.navigateTo({
          url: '/subpkg/goods_detail/goods_detail?goods_id=' + item.goods_id
        })
      },

      // 保存搜索记录
      saveSearchHistory(){
       // 将历史记录数组转换为对象
        const set = new Set(this.historyList)
        // 调用set方法 删除重复内容
        set.delete(this.kw)
        // 调用set方法,添加新内容到 末尾
        set.add(this.kw)
        // 将处理过的对象转化为数组
        this.historyList = Array.from(set)
        // 历史记录持久化
        uni.setStorageSync('kw',JSON.stringify(this.historyList))
      },
      
      // 清空搜索记录
      clean(){
        this.historyList = []
        uni.setStorageSync('kw','[]')
      },
      
      // 搜索联想跳转商品页
      gotoGoodsList(kw){
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?query=' + kw
        })
      },
      
    },
    
    // 计算属性
    computed:{
      // 搜索历史反转
      histories(){
      return  [...this.historyList].reverse()
      }
    },
    
    // 
  }
</script>

<style lang="scss">
  .search-box {
    position: sticky;
    top: 0;
    z-index: 999;
  }

  .sugg-list {
    padding: 0 10px;

    .sugg-item {
      display: flex;
      justify-content: space-between;
      font-size: 12px;
      padding: 8px 0;
      border-bottom: 1px solid #efefef;

      .goods-name {
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
      }
    }
  }
  
  .history-box{
    padding: 0 5px;
    .history-title{
      display: flex;
      justify-content: space-between;
      height: 40px;
      align-items: center;
      font-size: 13px;
      border-bottom: 1px solid #efefef;
    }
    .history-list{
      display: flex;
      flex-wrap: wrap;
    }
    .uni-tag {
        margin-top: 5px;
        margin-right: 5px;
    }
  }
</style>
